With some modification, Fabius believed he could create visual organs that would function at peak efficiency in total darkness, bright light or stroboscopic conditions, rendering an Astartes effectively immune to being blinded or disorientated.

His first success sat behind him on steel shelves in thousands of vials of blue liquid, a drug he had synthesised from a genetic splice between a gland taken from the Laer that replicated the functions of the thyroid gland and the Biscopea.

In the test subjects - those warriors wounded too badly to survive - Fabius had found that their metabolism and strength had increased markedly before their deaths. Refinement of the drug had kept the increases from overloading the recipient's heart, and now it was ready for distribution to the Legion en masse.

Fulgrim had authorised the use of the drug and within days it would be coursing through the blood of every warrior who chose to take it.

Fabius straightened from the dead body before him and smiled at the thought of the wonders he could create now that he had a free hand in turning his genius to improving the physical stature of the Emperor's Children.

'Yes,' he hissed, his dark eyes alight with the prospect of unlocking the secrets of the Emperor's work. 'I will know your secrets.'

The colours on the palette swirled before Serena's eyes, and the blandness of them infuriated her beyond measure. She had spent the best part of the morning attempting to create the red of the sunset she had seen on Laeran, but the emptied pots of paint and broken brushes scattered around her bore mute testament to her failure. The canvas before her was a mess of frantic pencil strokes, the oudine of a painting that she was sure would be her greatest work… if only she could get this red to mix properly!

'Damn you!' she shouted and hurled the palette away with such force that it smashed to splinters on the wall.

Her breath came in short, painful gasps as the frustration built within her. Serena put her head in her hands and tears came on the heels of hard, wracking sobs that hurt her chest.

The anger at her failure surged through her body, and she snatched up the broken stem of a paintbrush and pressed the jagged edge of wood into the soft skin of her upper arm. The pain was intense, but at least she could feel it. The skin broke and blood welled around the splintered wood, bringing her a measure of relief. Only the pain made anything real, and Serena ground the wood deeper into her flesh, watching as the blood ran down her arm over the pale ridges of her older scars.

Long, dark hair hung in lank ribbons to Serena's waist, stained with spots of colour, and her skin had the unhealthy pallor of one who had not slept in days. Her eyes were bloodshot and grainy, her fingernails cracked and encrusted with paint.

Her studio had been turned upside down since she had returned from the surface of Laeran. It was not vandalism that had brought about such a transformation, but a frenzied passion to create that had reduced her once immaculate studio to something that resembled the aftermath of a battle.

The desire to paint had been like an elemental force within her that could not be denied. It had been thrilling and a little bit frightening… the burning need to create art of passion and sensuality. Serena had filled three canvases with colour and light, painting like a woman possessed before exhaustion had claimed her and she had fallen asleep in the ruin of her studio.

When she had awoken she had looked at what she had painted with a critical eye, seeing the crudity of the work, and the primitive colours that had none of the life and urgency she remembered from the temple. Serena had dug through the disarray of her studio for the picts she had taken of the temple and the mighty coral city, its gloriously masculine towers and wondrously hued skies and ocean.

For days she had tried to rekindle the rapturous sensations that had filled her on Laeran, but no matter what proportions she mixed her paints in, she could not achieve the tonal qualities she sought.

Serena cast her mind back to Laeran, remembering the sorrow she had felt when Ostian had been denied a place in the craft travelling to the planet's surface. Guiltily, that sorrow had vanished when they had broken the cloud cover, and she had seen the vast blue expanse of the oceans of Laeran spread before her.

She had never seen such a glorious, vivid blue and had snapped a dozen picts before they had even begun their descent towards the Laer atoll. Circling the floating city had stirred feelings within her that she hadn't known existed, and Serena had ached to set foot on its alien structure more than anything.

Upon landing they had been escorted through the broken ruins of the city, every one of the remembrancers staring open mouthed at the wonderful otherness of it all. Captain Julius had explained that the tall conch towers had screamed all through the war, though all but a handful were now silenced, brought down by explosives to render them mute. The few ululating screams Serena could hear sounded impossibly distant, achingly lonely and infinitely sad.

Serena had taken pict after pict as they were led through the wreckage of battle, and even the torn corpses of the Laer could not detract from the thrill of walking on a city that floated above the ocean. The sights and colours were so vibrant that she couldn't take it all in, her senses stimulated to the point of overload.

Then she had seen the temple.

All thoughts other than achieving entry to its mysterious interior were banished from her mind as Captain Julius and the iterators had led the way towards the towering structure. A hungry, intense determination had seized the remembrancers, and they made their way towards the temple with unseemly haste.

Picking their way through the rubble, she had smelled the strange, smoky aroma of what she had at first thought to be incense, burnt by the Army units to mask the stench of blood and death. Then she saw the ghostly wisps of pink mist seeping from the porous walls of the temple and realised that it was something of alien origin. A delicious, momentary panic filled her until she smelled more of the strange musk and decided that it was quite pleasant.

Arc lights had been set up inside the cave-like entrance of the temple, and the brilliant glow illuminated wondrous colours and murals of such lifelike imagery that they took her breath away. Gasps of astonishment came from all around her as artists attempted to capture the scale of the murals, and imagists took panoramic picts of the scene.

From somewhere inside, Serena could hear music, wild, passionate music that lodged like a splinter in her heart. She turned from the murals, following the blue hair of Bequa as the siren song of the music grew louder and drew them both onwards.

From nowhere, her anger at Bequa suddenly pounded hot in her veins, and she felt her lip curl back in a snarl. Serena set off after Bequa, the music of the temple swelling within her the deeper she went. Though she was conscious of people around her, Serena paid them no mind, her thoughts filled with the sensations flooding her system. Music, light and colour were all around her, and she put a hand out to steady herself as the sheer excessiveness of it all threatened to overwhelm her.

Serena pushed herself onwards, rounded a corner into the temple's interior… and dropped to her knees as she saw terrifying beauty and awesome energy in the lights and noise of the temple.

Bequa Kynska stood in the middle of the great space, her arms raised in a V as she held up the wands of a vox-thief and the music poured over her.

Serena thought she'd never seen anything so beautiful in all her life.

Her eyes burned with colour and it had been all she could do not to weep at its perfection.